EP1412841B1 - Procede de transmission de flux de donnees et sequence de demarrage a chaud pour modems shdsl - Google Patents

Procede de transmission de flux de donnees et sequence de demarrage a chaud pour modems shdsl Download PDF

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Publication number
EP1412841B1
EP1412841B1 EP02758412A EP02758412A EP1412841B1 EP 1412841 B1 EP1412841 B1 EP 1412841B1 EP 02758412 A EP02758412 A EP 02758412A EP 02758412 A EP02758412 A EP 02758412A EP 1412841 B1 EP1412841 B1 EP 1412841B1
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EP
European Patent Office
Prior art keywords
subscriber
transmission
warm start
activation
start sequence
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP02758412A
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German (de)
English (en)
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EP1412841A1 (fr
Inventor
Bernd Heise
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Intel Germany Holding GmbH
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Lantiq Deutschland GmbH
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Publication date
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Publication of EP1412841A1 publication Critical patent/EP1412841A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
    • H04L2025/03375—Passband transmission
    • H04L2025/03414—Multicarrier
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/03592—Adaptation methods
    • H04L2025/03598—Algorithms
    • H04L2025/03611—Iterative algorithms
    • H04L2025/03656—Initialisation
    • H04L2025/03668—Initialisation to the value at the end of a previous adaptation period

Definitions

  • the present invention relates to a method and a device for transmitting data streams, and in particular relates to a method for transmitting data streams, in which a warm start sequence is executed for activating transceiver devices (modems) deactivated in a standby state.
  • modems transceiver devices
  • the xDSL technologies are different ways of using / carrying a wired data stream transmission from a central office to a subscriber site.
  • These transmission methods via the at least one data transmission path are based on switching-side transceiver devices and subscriber-side transceiver devices, the problem being that both transceiver devices are to be transferred or deactivated for energy-saving purposes into an energy-saving mode.
  • the deactivated transceiver devices In order to enter an operating mode from an energy-saving mode or a standby mode, the deactivated transceiver devices must be reactivated by means of a warm-start sequence.
  • the switching-side transceiver devices and the subscriber-side transceiver devices adapt to the parameters or properties of the line of the data transmission path.
  • this process typically lasts 30 seconds and more, so that a warm start, which has a warm start sequence, and requires much less time for activation, is absolutely necessary.
  • knowledge of the characteristics of the line of the data transmission path must be carried out in a fraction of the above-mentioned time (30 seconds).
  • FIG. 3 shows a flowchart in block form for illustrating a method for transmitting data streams according to the prior art.
  • disturbances such as temperature fluctuations or changes in air humidity have an effect on conduction properties, whereby the conduction properties can be changed in an unpredictable manner.
  • Another disadvantage of known methods is that there are transceivers that require a signalless signal from a far end ("far end signal”) prior to synchronization to adapt to a change in an echo of the own transmit signal, among other things is also caused by a change in line characteristics of the at least one data transmission path.
  • a fixed warm start sequence in the switching-side transceiver devices and the subscriber-side transceiver devices would require a great deal of effort and unnecessarily extend a warm-start sequence, which, in addition to an increase in costs, also leads to a reduction of the specific advantages of a warm start.
  • the US 5,852,630 relates to a method and apparatus for a RADSL transceiver warm start activation procedure wherein an improvement in DSL communication is achieved by executing a shortened warm start training sequence. Disadvantageously, the process requires the US 5,852,630 a large number of warm start steps.
  • the US 5,631,952 describes an apparatus and method for a data communication device, such as a modem, to transition from a standby state to a conventional one. Operating state.
  • a data communication device such as a modem
  • an interrupt signal is generated following the determination within a first predetermined time period, and a transition of the data communication device from the standby state to the operating state in response to the interrupt signal.
  • the process requires the US 5,631,952 a fixed procedure for a warm start and is inconveniently inflexible in that a fixed process is avoided in an activation of disabled in a standby state transceivers.
  • An essential concept of the invention is to predeterminably insert at least one additional segment into a warm start sequence before a synchronization is carried out.
  • four additional segments are provided which can be inserted individually or in any combination into a warm start sequence, which is agreed upon either during a cold start activation or during the respectively preceding activation (cold start or warm start).
  • the o.a. refers to an echo cancellation.
  • a successful cold start has taken place, wherein in the cold start, each side (switch side and / or user side) of the other side, a transmission of specific signals.
  • two bits are contained in S (H) DSL activation frames per data transmission direction, which determine which of the above-mentioned steps a) to d) are executed.
  • time durations for signals with which an echo cancellation re-adjustment is carried out are transmitted.
  • waiting periods between successive sequences can be variably predetermined.
  • FIG. 1 shows a warm start sequence, wherein between steps that are performed in a switch-side transceiver LTU, and steps that are performed in a subscriber-side transceiver NTU, a distinction is made.
  • a warm start sequence is started by the subscriber side by sending a so-called wake-up signal, whereupon a response is made from the exchange side via the exchange side transceiver device. It should be noted that it is also possible to provide a "wake-up" signal from the switch-end transceiver LTU, in which case a response from the subscriber-side transceiver NTU is not expected.
  • WUN wakeup of NTU, of the subscriber-side transceiver device.
  • the switch-side transceiver LTU responds to the signal W WUN with a signal W WUL .
  • waiting times are considered equal in the length of time in the FIG. 1 are shown, the waiting times can take different durations.
  • one or more of the steps S103-S106 can then be predetermined.
  • step S103 a subscriber-side transmission line determination is performed, wherein a signal W LPN is transmitted.
  • a switch-side transmission line determination is made, and a signal W LPL is sent out.
  • the two transmission line determination steps serve to effectively determine the characteristics of a specific transmission line of the at least one data transmission path upon a warm start. It should be noted that steps S103-S106 may be performed in any order according to the present invention.
  • a subscriber-side readjustment step S105 is performed, wherein an echo canceling signal W ECN is transmitted during a time t ECN .
  • a subscriber-side readjustment takes place.
  • a subsequent switch-side readjustment step results from the switch side, i. from the transmission-side transceiver LTU, an equivalent step to the step S105.
  • Step S107-S108 corresponding to the sequence of one with reference to FIG. 3 described conventional method for transmitting data streams.
  • the subscriber-side transceiver device is in an operating state, so that a subsequent subscriber-side acknowledgment step S109 takes place with a signal W OKN .
  • a synchronization takes place in a step S108, wherein a signal W SL is provided.
  • a signal W SL is provided at a time with an arrow (b) in FIG. 1 are both the switching-side transceiver device LTU and the subscriber-side transceiver NTU in an operating state.
  • switching-side confirmation step S110 is a common data transmission, both transceivers are transparent to payload, in the embodiment shown the FIG. 1 referred to as data stream transmission step S111.
  • FIG. 2 shows a flowchart of an embodiment of the inventive method for transmitting data streams, wherein after a start step S100, a subscriber-side activation step S101 and then a switching-side activation step S102 takes place.
  • Steps S103 to S106 include as described above with reference to FIG. 1 mentioned, a transmission-side transmission line determination step S103, a subscriber-side transmission line determination step S104, a subscriber-side readjustment step S105, and a transmission-side readjustment step S106.
  • the dashed lines which lead to the subscriber-side synchronization step S107 illustrate that it is predeterminable to carry out none or at least one of the steps S103-S106, but an order can be arranged as desired.
  • a synchronization-side synchronization step S107 After execution of none, one or more of the steps S103-S106 according to the invention, a synchronization-side synchronization step S107, a switching-side synchronization step S108 and a data-stream transmission step S111 are performed as described in prior art data-stream transmission methods, for example, with reference to FIG FIG. 3 ,
  • a warm start sequence is designed to be very flexible, wherein in addition a control can be determined by previously unused bits with respect to the segments to be executed in the warm start phase in a cold start phase. Furthermore, a selection of periods of the segments in the cold start phase can be determined.

Claims (4)

  1. Procédé pour transmettre flux de données, selon lequel on exécute une séquence de démarrage à chaud pour l'activation de dispositifs d'émission et de réception (LTU, NTU) désactivés dans un état de disponibilité, sachant que l'on détermine, dans une activation chronologiquement antérieure et au moyen d'une trame d'activation qui comporte au moins deux bits pour chaque sens de transmission de données, lesquelles des étapes suivantes sont exécutées dans la séquence de démarrage à chaud :
    a) détermination de paramètres de ligne de transmission (S103) au moyen d'un dispositif d'émission et de réception côté ligne (LTU) après une mise à disposition d'un signal d'émission côté abonné (S101) ;
    b) détermination de paramètres de ligne de transmission (S104) au moyen d'un dispositif d'émission et de réception côté abonné (NTU) après une mise à disposition d'un signal d'émission côté ligne (S102) ;
    c) réadaptation d'une élimination d'écho (S105) au moyen d'un dispositif d'émission et de réception côté abonné (NTU) après une mise à disposition d'un signal d'émission côté abonné (S101) ;
    d) réadaptation d'une élimination d'écho (S106) au moyen d'un dispositif d'émission et de réception côté ligne (LTU) après une mise à disposition d'un signal d'émission côté ligne (S102).
  2. Procédé selon la revendication 1, caractérisé en ce que, dans une activation chronologiquement antérieure, des durées pour des signaux, avec lesquels une réadaptation d'une élimination d'écho est effectuée, sont transmises.
  3. Procédé selon la revendication 1, caractérisé en ce que, dans une activation chronologiquement antérieure, des durées pour des signaux, avec lesquels les paramètres de ligne de transmission sont déterminés, sont transmises.
  4. Procédé selon la revendication 1, caractérisé en ce que des durées de temps d'attente entre des séquences successives peuvent être prescrites variablement.
EP02758412A 2001-08-03 2002-07-30 Procede de transmission de flux de donnees et sequence de demarrage a chaud pour modems shdsl Expired - Fee Related EP1412841B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10139779A DE10139779C2 (de) 2001-08-03 2001-08-03 Verfahren zum Übertragen von Datenströmen und Warmstart-Sequenz für S(H)DSL-Sendeempfangseinrichtungen
DE10139779 2001-08-03
PCT/EP2002/008485 WO2003014900A1 (fr) 2001-08-03 2002-07-30 Procede de transmission de flux de donnees et sequence de demarrage a chaud pour modems shdsl

Publications (2)

Publication Number Publication Date
EP1412841A1 EP1412841A1 (fr) 2004-04-28
EP1412841B1 true EP1412841B1 (fr) 2010-07-07

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EP02758412A Expired - Fee Related EP1412841B1 (fr) 2001-08-03 2002-07-30 Procede de transmission de flux de donnees et sequence de demarrage a chaud pour modems shdsl

Country Status (5)

Country Link
US (1) US7139310B2 (fr)
EP (1) EP1412841B1 (fr)
CN (1) CN1304917C (fr)
DE (1) DE10139779C2 (fr)
WO (1) WO2003014900A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10201415B4 (de) * 2002-01-15 2004-12-09 Infineon Technologies Ag Verfahren zum Aufbau einer Datenübertragungsverbindung zwischen xDSL-Transceivern und xDSL-Transceiver
DE102009047199A1 (de) 2009-11-26 2011-06-01 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Eine Datenübertragungsvorrichtung und ein Verfahren zum Aktivieren einer Datenübertragung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0817375B2 (ja) * 1992-09-11 1996-02-21 日本電気株式会社 サンプリング位相抽出回路
US5631952A (en) * 1994-10-18 1997-05-20 Motorola, Inc. Apparatus and method for modem wake-up with autobaud function
US5852630A (en) * 1997-07-17 1998-12-22 Globespan Semiconductor, Inc. Method and apparatus for a RADSL transceiver warm start activation procedure with precoding
US6240180B1 (en) * 1997-11-14 2001-05-29 Tellabs Operations, Inc. Echo canceller employing dual-H architecture having split adaptive gain settings
US7085285B2 (en) * 2000-03-01 2006-08-01 Realtek Semiconductor Corp. xDSL communications systems using shared/multi-function task blocks
US6690655B1 (en) * 2000-10-19 2004-02-10 Motorola, Inc. Low-powered communication system and method of operation

Also Published As

Publication number Publication date
DE10139779C2 (de) 2003-06-26
DE10139779A1 (de) 2003-02-20
CN1555519A (zh) 2004-12-15
US20030048384A1 (en) 2003-03-13
EP1412841A1 (fr) 2004-04-28
US7139310B2 (en) 2006-11-21
CN1304917C (zh) 2007-03-14
WO2003014900A1 (fr) 2003-02-20

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